<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div></div>
    <script>
        const gift = '50g的茶叶,清洗球'
        // 1.把字符串拆分成数组 2.map遍历，根据数组元素个数，生成对应span标签
        const str = gift.split(',').map(item => {
            return `<span>【赠品】${item}</span> <br>`
        }).join('')
        // console.log(str);
        document.querySelector('div').innerHTML = str
    </script>
</body>

</html>